Section 325.51156. Exposure monitoring; frequency.

(1) If the monitoring required by R 325.51155 reveals employee exposure to be at or above the action level, but below the 8-hour TWA, an employer shall repeat such monitoring for each such employee at least every 6 months.

(2)   If monitoring required by R 325.51155 reveals that employee exposure is above the 8-hour TWA, an employer shall repeat such monitoring for each affected employee at least every 3 months.

(3)   The employer may alter the monitoring schedule from quarterly to semiannually for any employee for whom 2 consecutive measurements, taken not less than 7 days apart, indicate that the employee's exposure has decreased to or below the 8-hour TWA.

(4)   If there has been a production, process, control equipment, personnel, or work practice change that might result in new or additional employee exposure to EtO, or if an employer has any other reason to suspect a change that might result in new or additional

exposures to EtO, the employer shall institute additional monitoring pursuant to this standard.

History: 1988 AACS; 1993 AACS; 2015 AACS.